Lord Fink, who resumed his position as Tory party treasurer over the weekend after the resignation of Peter Cruddas, was dubbed a "forgotten donor" on Tuesday night after his name was left off a list of donors invited to Chequers by David Cameron.

The hedge fund manager was one of three Conservative donors entertained by the prime minister at his official country residence whose names were not included on a list issued on Monday by the Conservative party. The other donors were Sir Christopher Gent, the chairman of GlaxoSmithKline, and Paul Walsh, the chief executive of Diageo.

Feldman was listed in the Conservative party list on Monday as having visited Chequers on "several occasions", unlike Fink, Gent and Walsh.

Jon Trickett, the shadow Cabinet Office minister, said: "David Cameron has already had to be dragged kicking and screaming to release the details of his meetings with wealthy donors at No 10 and Chequers. Now we know the lists he published yesterday were incomplete – and that donors who gave over £2.4m had been casually omitted."

Some blame for the debacle has been levelled at Lord Feldman of Elstree, the Tory co-chairman who approved the appointment of Cruddas, who quit when the Sunday Times published a video in which he suggested there was a tariff of donations which could lead to varying levels of access to the prime minister.

Feldman is one of the prime minister's closest friends since their days on the May Ball committee at Brasenose College in the mid 1980s. One senior Tory figure said: "There is only one reason why Feldman is chairman of our party. He is Dave's old mate from Oxford and has for years played tennis with him. That clearly is not a good enough qualification to be chairman of the Conservative party and he is being found out. But nothing will change because everything is so cosy in the Dave circle."

Conservative sources said there was no mystery why the three donors were not on the Chequers list, which covered meals paid for by the Conservative party. The three donors were invited as leading businessmen to government events paid for out of public funds. Their names were published on a previous cabinet office list of government guests invited to Chequers.